Well you have 3 main options. 1.) Sell at a discount to a dealer or coin shop. 2.) Sell online via ebay or a similar site. 3.) Post the collection here in a new post and hope someone sees it and contacts you. If you have an ebay account with previous sales, and a 5 star review I might consider starting there. We wrote this article on the question. Give it a read. https://cointrackers.com/sell-your-coins/